Velcro attached to the underside of a 1/4 inch mesh frame
I slit the cover to slide over the mesh
I removed the foam liner
Note that one side is much warmer than the other (at least with mine)
I originally had it as a symmetrical curve like a quonset hut, but then bent it into more of the shape of an airplane wing cross section: large on once side, sloping towards flat on the other. They move around as they need.
Chicks are much happier than when under the lamp. I now have a 65W spotlight for daytime, but they are happily sleeping under the warm wing right now.
Unfortunately, I didn't really pay attention until after I took off the cloth and foam pad. I put my hand down and found one side was about twice the heat as the other.
I would think that it was the foam pad side, and that the foam diffuses the heat, making it more comfortable for the user.
So, what I did was:
Took off the cover and discarded the foam
Used velcro to attach the vinyl to the 1/4 inch mesh. It wasn't entirely stable, so I:
Slit the cover enough to get through the mesh. It wasn't easy pulling it on, so I pulled it over similar to if you ever put a cover on a down comforter.
That was still too loose, so I bunched up and tied the cover like a teenaged girl bunches up an oversized teeshirt.
Note that I de-burred the mesh with a file so no one would get hurt before slipping the cover on.
Now, we're talking. I shaped the mesh. It was good. But the chicks were still chirping a bit, maybe excitement, maybe cold.
I laid that in the brooder, covered in wood chips. I didn't like the exposed mesh, so added a cloth placeholder for cover.
So I reshaped. I notice that they're all bunched in the shortest corner with most contact. They'll grow out in time, but I'm glad I reshaped.
Everyone is sleeping quietly and contently. Kind of amazing, to be honest.
Photos: Note how the MHP is slanted, this allows chicks to decide how warm they want to be. When they get a bit bigger, I'll move to the classic, symmetrical shape.
The pad is mounted to the underside of the mesh with velcro, but I cut a slit in the cloth cover to secure it and pad the mesh. I added 2 layers of cloth (placemat and a tea towel) as insulation.
Photos: Note how the MHP is slanted, this allows chicks to decide how warm they want to be. When they get a bit bigger, I'll move to the classic, symmetrical shape.